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  <title>iframe的使用</title>
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    <h1>第二章作业</h1>
    <a href="1.html" target="tupian">热门活动</a><br/>
    <a href="2.html" target="tupian">音乐排行榜</a><br/>
    <a href="3.html" target="tupian">使用表格制作流量查询表</a><br/>
    <a href="4.html" target="tupian">北大青鸟宣传片</a><br/>
    <a href="5.html" target="tupian">使用iframe嵌套网页</a>
    <hr />
    <iframe src="4.html" width="100%" height="2000" name="tupian" frameborder="0" 
     border="0" marginwidth="0" marginheight="0" scrolling="no"></iframe>
  </body>
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